The Invisible Man

Ralph (1x4)

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A young girl is a witness to an assassination by a sniper. Traumatized, she only speaks to her imaginary friend ""Ralph."" Darien, using his powers of invisibility, convinces the girl he is "Ralph" and tries to get her to talk about the murder. Eventually the hit man tries to kill the girl, and Darien manages to stop him. With his help, the girl starts to recover from her trauma, and leaves her "imaginary friend" behind.